Yes, TOH, I will record this number, too. When I remove the first-purchased coupler that doesn't fit, I'll check that number. It's awfully hard to see and these are not young eyes.
For some reason, these couplers/fittings don't make a lot of sense to me. Most of the time, with some mulling, I can begin to understand how things work. But...these seem to be a different animal. For example, I measured the face of the male fitting to see what coupler would fit and compared that with the chart to identify the correct coupler. That face was 1/2" so why would it take a 1/4" coupler? In another way, does it make any difference that I understand when I have the correct number for future needs for these couplers? It's much easier to fix things when understanding is present.
OTOH, maybe my expectations for myself are too high! It's a miracle that anything around here can be fixed! I attribute any success to my dear Father who was a DIY'er from the start. He was willing and patient to teach me. His best advice: remember the sequence of parts when you disassemble something! Sadly, there were times I was not attentive when taking something apart.
Anyway, thanks for all the help with this fitting. I'm hoping this solves the leaking problem; otherwise, it has been all for naught.
TG